diff --git a/Cask b/Cask
index a0cc0b9a1..96fc0551a 100644
--- a/Cask
+++ b/Cask
@@ -186,6 +186,7 @@
 (depends-on "php-refactor-mode")
 (depends-on "php-boris")
 (depends-on "php-extras")
+(depends-on "hack-mode" :git "https://github.com/beefsack/hack-mode")
 
 ;; Processing -- modules/module-processing.el
 (depends-on "processing-mode")
diff --git a/modules/module-php.el b/modules/module-php.el
index 5bc54bc01..56e0aa083 100644
--- a/modules/module-php.el
+++ b/modules/module-php.el
@@ -1,5 +1,9 @@
 ;;; module-php.el
 
+(use-package hack-mode
+  :mode "\\.hh$"
+  :config (define-company-backend! hack-mode (capf)))
+
 (use-package php-mode
   :mode ("\\.php[s345]?$" "\\.inc$" )
   :interpreter "php"